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@article{IM_1988__93_2_143607, author = {William J. Floyd and Steven P. Plotnick}, title = {Symmetries of planar growth functions.}, journal = {Inventiones mathematicae}, pages = {501--544}, publisher = {mathdoc}, volume = {93}, number = {2}, year = {1988}, zbl = {0652.20052}, url = {http://geodesic.mathdoc.fr/item/IM_1988__93_2_143607/} }
William J. Floyd; Steven P. Plotnick. Symmetries of planar growth functions.. Inventiones mathematicae, Tome 93 (1988) no. 2, pp. 501-544. http://geodesic.mathdoc.fr/item/IM_1988__93_2_143607/